1.	Simplify 1 Simplify the following expression: $$ \left(-4(-1) - \left(2 + -5\right)\right)2(-6)(-5) $$ Correct Answer $$ 420$$ or 420.000

2.	Simplify 2 Simplify the following expression: $$ \left(-2\times5 + -6(-2)\right)2\times5\times5 $$ Correct Answer $$ 100$$ or 100.000

3.	Fractions 1 Simplify the following expression: $$ \frac{4}{5} + \frac{-4}{6} $$ Correct Answer $$ \frac{2}{15}$$ or 0.13333333333333341

4.	Fractions 2 Simplify the following expression: $$ \frac{\frac{-5}{6}}{\frac{1}{2}} $$ Correct Answer $$ \frac{-5}{3}$$ or -1.6666666666666667

5.	Significant figures 1. Write the following to 5 significant figures: 392.21228 Correct Answer 392.21 or $$3.9221\times10^{2}$$ 2. Write the following to 2 significant figures: 0.0054589749 Correct Answer 0.0055 or $$5.5\times10^{-3}$$

6.	Standard Form 1. Write the following in standard form to 4 significant digits: 0.000000923854 Correct Answer $$9.239\times10^{-7}$$ 2. Write the following in standard form to 4 significant digits: 0.634356 Correct Answer $$6.344\times10^{-1}$$

7.	Significant figures 1. Write the following in preferred standard form to 2 significant digits: 63670 Correct Answer $$64\times10^{3}$$ 2. Write the following in preferred standard form to 4 significant digits: 1.48865 Correct Answer $$1.489\times10^{0}$$

8.	Simplify 2 Simplify the following expression: $$ \frac{\left(-6 - -6\right)\frac{-1}{5}}{{\left(-1 + 1\right)}^{2}} $$ Correct Answer $$ \frac{0}{0}$$ or NaN

9.	Simplify 1 Simplify the following expression: $$ 2\left(-4 - -2\right)\left(-2(-5) + 1(-1)\right) $$ Correct Answer $$ -36$$ or -36.0000

10.	Simplify 2 Simplify the following expression: $$ {\left(-6 - 3\right)}^{2} + \frac{-1 + 5}{-3 + 2} $$ Correct Answer $$ 77$$ or 77.0000